C:\> Rostislav Persion's Projects

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namespace Shuffle_002
{
    internal class Program
    {
        // a method for shuffling a string of characters
        static string ShuffleString(string inputstr)
        {

            char[] outputchr = inputstr.ToCharArray(0, inputstr.Length);

            Random rnd1 = new Random(Environment.TickCount);

            // use big O n^2 algorithm to randomly rearange letters in input string
            for (int x = 0; x < outputchr.Length; x++)
            {
                for (int y = 0; y < outputchr.Length; y++)
                {
                    int n1 = rnd1.Next(outputchr.Length);
                    int n2 = rnd1.Next(outputchr.Length);
                    char c1 = outputchr[n1];
                    char c2 = outputchr[n2];
                    outputchr[n2] = c1;
                    outputchr[n1] = c2;
                }
            }

            // convert char array into a string
            string outputstring = new string(outputchr);
            return outputstring;
        }

        // check to see if all letters are the same (NEW CODE)
        static bool AreAllLettersIdentical(string strIdent)
        {
            string firstletter = strIdent.Substring(0, 1);
            bool isident = true;
            // look for letters to not be the same as the first letter
            foreach (char ltr in strIdent)
            {
                if (ltr.ToString() != firstletter)
                {
                    isident = false;
                }
            }
            return isident;
        }

        // a method for turning a string into a string of scranbled words
        static string ShuffleSentence(string inputSentence)
        {
            // output buffer
            string outputBuffer = "";

            // split the input string into a string array of words
            string[] strChopped = inputSentence.Split(" ");

            // declare primary variables
            string firstLetter;
            string lastLetter;
            string middleString;
            string middleStringShuffled;

            foreach (string strCurrent in strChopped)
            {

                // if the string has more than one middle letters then rearange them
                if (strCurrent.Length > 3)
                {
                    firstLetter = strCurrent.Substring(0, 1);
                    lastLetter = strCurrent.Substring(strCurrent.Length - 1);
                    middleString = strCurrent.Substring(1, strCurrent.Length - 2);
                    middleStringShuffled = ShuffleString(middleString);

                    // check to see if all letters in a string are identical, if not keep shuffling (NEW CODE)
                    while ((!AreAllLettersIdentical(middleString)) & (middleString == middleStringShuffled))
                    {
                        middleStringShuffled = ShuffleString(middleString);
                    }


                }

                // if the string has less than two middle letters then just output the original string
                else
                {
                    firstLetter = "";
                    lastLetter = "";
                    middleStringShuffled = strCurrent;
                }

                // append output buffer
                outputBuffer += firstLetter + middleStringShuffled + lastLetter + " ";
            }

            return outputBuffer;

        }

        static void Main(string[] args)
        {

            // keep program going forever
            while (true)
            {

                // input sentence
                Console.ForegroundColor = ConsoleColor.Green;
                Console.Write("ENTER A SENTENCE: ");
                string strMain = Console.ReadLine();
                Console.WriteLine("");

                Console.ForegroundColor = ConsoleColor.Yellow;
                Console.WriteLine(ShuffleSentence(strMain));

                // create vertical spacing between lines
                Console.WriteLine("");
                Console.WriteLine("");

            }

        }
    }
}